Portable sink



FIG. 1 is a perspective, right side and front view showing my design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view of a portable sink, showing the second embodiment;

FIG. 6 is a top plan view thereof;

FIG. 7 is a right side elevational view thereof; and,

FIG. 8 is a left side elevational view thereof. 

The ornamental design for a portable sink, as shown and described. 